Calculate mean of every nth row in a table

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Dear MATLAB experts,
I'm trying to get the mean value of every third row starting from the first row in a table. So, I would like to get the mean value of the 1st, 4th, 7th, 10th, 13th, 16th, 19th... up to the 666679th row and apply the same approach to the other remaining rows, 2nd, 5th, 8th, 11th, 14th... up to the 666680th row and to the 3rd, 6th, 12th, 15th, 18th... up to the 666681th row.
This means that I would like to get 3 mean values and I want to do this for the column of the table you will find attached to this post.
I would really appreciate your help since I don't even know how to approach this problem. Thank you in advance.

Accepted Answer

André Kucharzewski
André Kucharzewski on 26 Oct 2021
>> v = randi(100,100,1)
>> mean(v(1:2:end)
or mean(v(1:3:end)
in your case end could be 666679

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